Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!sdd.hp.com!hp-pcd!hpsgwp!plim From: plim@hpsgwp.sgp.hp.com (Peter Lim) Newsgroups: comp.sys.ibm.pc.hardware Subject: Re: Gray Scale Graphics For HP IIP Message-ID: <3370016@hpsgwp.sgp.hp.com> Date: 13 Mar 91 01:55:29 GMT References: <7784@drutx.ATT.COM> Organization: HP Singapore IC Design Ctr Lines: 42 / andrewsh@lonex.radc.af.mil (Harold G. Andrews II) / 12:30 am Mar 13, 1991 / writes: > I just responded to another individual on the comp.graphics news group with > other objections. The series III's Resolution Enhancement Technology has > the ability to change to dot pitch, primarily to allow variable dot pitches > to help reduce jaggies. This does not address the problem of grayscale. > Reducing jaggies is the main marketing point of the LJ III, it brings attention to something that the masses can see clearly. That is why most people associate the LJ III RET with reducing jaggies. But the RET essentially address "grayscale" problem as best as we can now. It is capable of giving shades by changing the dot size without compromising resolution (as done in dithering). So, as far as your eyes can tell, this looks like shades of gray at 300 dpi. > Grayscale images involve varying the amount of toner deposited onto the paper. > Laser printers cannot, at this time, do that. What they can do, through > the use of dithering and halftones is give the appearance of grayscale. > When you boil it down, though, laser printers are incapable of producing > true grayscale images. > But of course if you are talking about really absolute grayscale as in the dot changing from black thru gray to white, then NO, LJ III can't do it and no other laser printer can do it either. The real gray scale actually requires varying of color (and not dot size or the amount of toner for that matter) --- like what you see on your color monitor. Gray is essentially a different color from black or white. This is what slipped my mind in my first posting. My appology. Regards, . .. ... .- -> -->## Life is fast enough as it is ........ Peter Lim. ## .... DON'T PUSH IT !! >>>-------, ########################################### : E-mail: plim@hpsgwg.HP.COM Snail-mail: Hewlett Packard Singapore, : Tel: (065)-279-2289 (ICDS, ICS) | Telnet: 520-2289 1150 Depot Road, __\@/__ Singapore 0410. SPLAT ! #include